The treb is rendered, but I don't have enough memory on my computer to compile it in gp format. (3 gigs) The frames are really big because the treb will look realistic that way and the crew isn't bigger than the other troops in AC. They are I think 1500 pixels by 1500.

The way to resolve this is to render it closer or something. Idk at the moment. Or make the treb model really small then render it?

I wonder if you can compile them into a bunch of separate gp's and then in the md do like the cannon animation with several #PUATTACK or what not going through each gp until it gets to the stand animation or prepare to fire.

Just had a look at the treb gp with Gp viewer, that treb is a work of art OSS, its a real credit to you, you have done a fantastic job! If you could keep the treb crew the same size as normal units would be a bonus, as it would look odd if they were smaller than other units, but I can understand your situation.